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Surface Area of Triangular Prisms — Easy Worksheet 1
Grade 7 · MathSheets Name: ____________________ Date: __________
Find each surface area: 2 triangles + 3 rectangles.
How to solve
A triangular prism has 2 triangle faces and 3 rectangle faces. The two triangles together make b × h. The three rectangles are all as long as the prism, so together they are (perimeter of the triangle) × length. Base 6, height 4, slanted sides 5, length 10: 6 × 4 = 24, and (6 + 5 + 5) × 10 = 160, so SA = 184 square units.
Example
The prism is measured in meters. Each slanted side of the triangle is 5 meters. Find the surface area in square meters.
Answer: 78
Not quite. The answer is
💡 Two triangles: 2 × 12 × 8 × 3 = 24. Three rectangles: (8 + 5 + 5) × 3 = 54. SA = 24 + 54 = 78 square inches.
✓ Correct!
Not quite. The answer is
💡 Two triangles: 2 × 12 × 8 × 3 = 24. Three rectangles: (8 + 5 + 5) × 3 = 54. SA = 24 + 54 = 78 square inches.
💡 How to solve: Surface Area of Triangular Prisms
A triangular prism has 2 triangle faces and 3 rectangle faces. The two triangles together make b × h. The three rectangles are all as long as the prism, so together they are (perimeter of the triangle) × length. Base 6, height 4, slanted sides 5, length 10: 6 × 4 = 24, and (6 + 5 + 5) × 10 = 160, so SA = 184 square units.
Try a similar one
The prism is measured in inches. Each slanted side of the triangle is 5 inches. Find the surface area in square inches.
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 Two triangles: 2 × 12 × 8 × 3 = 24. Three rectangles: (8 + 5 + 5) × 3 = 54. SA = 24 + 54 = 78 square centimeters.
✓ Correct!
Not quite. The answer is
💡 Two triangles: 2 × 12 × 8 × 3 = 24. Three rectangles: (8 + 5 + 5) × 3 = 54. SA = 24 + 54 = 78 square centimeters.
💡 How to solve: Surface Area of Triangular Prisms
A triangular prism has 2 triangle faces and 3 rectangle faces. The two triangles together make b × h. The three rectangles are all as long as the prism, so together they are (perimeter of the triangle) × length. Base 6, height 4, slanted sides 5, length 10: 6 × 4 = 24, and (6 + 5 + 5) × 10 = 160, so SA = 184 square units.
Try a similar one
The prism is measured in feet. Each slanted side of the triangle is 5 feet. Find the surface area in square feet.
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 Two triangles: 2 × 12 × 6 × 4 = 24. Three rectangles: (6 + 5 + 5) × 5 = 80. SA = 24 + 80 = 104 square feet.
✓ Correct!
Not quite. The answer is
💡 Two triangles: 2 × 12 × 6 × 4 = 24. Three rectangles: (6 + 5 + 5) × 5 = 80. SA = 24 + 80 = 104 square feet.
💡 How to solve: Surface Area of Triangular Prisms
A triangular prism has 2 triangle faces and 3 rectangle faces. The two triangles together make b × h. The three rectangles are all as long as the prism, so together they are (perimeter of the triangle) × length. Base 6, height 4, slanted sides 5, length 10: 6 × 4 = 24, and (6 + 5 + 5) × 10 = 160, so SA = 184 square units.
Try a similar one
The prism is measured in centimeters. Each slanted side of the triangle is 5 centimeters. Find the surface area in square centimeters.
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 Two triangles: 2 × 12 × 6 × 4 = 24. Three rectangles: (6 + 5 + 5) × 4 = 64. SA = 24 + 64 = 88 square meters.
✓ Correct!
Not quite. The answer is
💡 Two triangles: 2 × 12 × 6 × 4 = 24. Three rectangles: (6 + 5 + 5) × 4 = 64. SA = 24 + 64 = 88 square meters.
💡 How to solve: Surface Area of Triangular Prisms
A triangular prism has 2 triangle faces and 3 rectangle faces. The two triangles together make b × h. The three rectangles are all as long as the prism, so together they are (perimeter of the triangle) × length. Base 6, height 4, slanted sides 5, length 10: 6 × 4 = 24, and (6 + 5 + 5) × 10 = 160, so SA = 184 square units.
Try a similar one
The prism is measured in feet. Each slanted side of the triangle is 5 feet. Find the surface area in square feet.
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 Two triangles: 2 × 12 × 8 × 3 = 24. Three rectangles: (8 + 5 + 5) × 4 = 72. SA = 24 + 72 = 96 square meters.
✓ Correct!
Not quite. The answer is
💡 Two triangles: 2 × 12 × 8 × 3 = 24. Three rectangles: (8 + 5 + 5) × 4 = 72. SA = 24 + 72 = 96 square meters.
💡 How to solve: Surface Area of Triangular Prisms
A triangular prism has 2 triangle faces and 3 rectangle faces. The two triangles together make b × h. The three rectangles are all as long as the prism, so together they are (perimeter of the triangle) × length. Base 6, height 4, slanted sides 5, length 10: 6 × 4 = 24, and (6 + 5 + 5) × 10 = 160, so SA = 184 square units.
Try a similar one
The prism is measured in feet. Each slanted side of the triangle is 5 feet. Find the surface area in square feet.
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 Two triangles: 2 × 12 × 8 × 3 = 24. Three rectangles: (8 + 5 + 5) × 5 = 90. SA = 24 + 90 = 114 square meters.
✓ Correct!
Not quite. The answer is
💡 Two triangles: 2 × 12 × 8 × 3 = 24. Three rectangles: (8 + 5 + 5) × 5 = 90. SA = 24 + 90 = 114 square meters.
💡 How to solve: Surface Area of Triangular Prisms
A triangular prism has 2 triangle faces and 3 rectangle faces. The two triangles together make b × h. The three rectangles are all as long as the prism, so together they are (perimeter of the triangle) × length. Base 6, height 4, slanted sides 5, length 10: 6 × 4 = 24, and (6 + 5 + 5) × 10 = 160, so SA = 184 square units.
Try a similar one
The prism is measured in meters. Each slanted side of the triangle is 5 meters. Find the surface area in square meters.
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 Two triangles: 2 × 12 × 8 × 3 = 24. Three rectangles: (8 + 5 + 5) × 4 = 72. SA = 24 + 72 = 96 square centimeters.
✓ Correct!
Not quite. The answer is
💡 Two triangles: 2 × 12 × 8 × 3 = 24. Three rectangles: (8 + 5 + 5) × 4 = 72. SA = 24 + 72 = 96 square centimeters.
💡 How to solve: Surface Area of Triangular Prisms
A triangular prism has 2 triangle faces and 3 rectangle faces. The two triangles together make b × h. The three rectangles are all as long as the prism, so together they are (perimeter of the triangle) × length. Base 6, height 4, slanted sides 5, length 10: 6 × 4 = 24, and (6 + 5 + 5) × 10 = 160, so SA = 184 square units.
Try a similar one
The prism is measured in feet. Each slanted side of the triangle is 5 feet. Find the surface area in square feet.
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 Two triangles: 2 × 12 × 8 × 3 = 24. Three rectangles: (8 + 5 + 5) × 4 = 72. SA = 24 + 72 = 96 square inches.
✓ Correct!
Not quite. The answer is
💡 Two triangles: 2 × 12 × 8 × 3 = 24. Three rectangles: (8 + 5 + 5) × 4 = 72. SA = 24 + 72 = 96 square inches.
💡 How to solve: Surface Area of Triangular Prisms
A triangular prism has 2 triangle faces and 3 rectangle faces. The two triangles together make b × h. The three rectangles are all as long as the prism, so together they are (perimeter of the triangle) × length. Base 6, height 4, slanted sides 5, length 10: 6 × 4 = 24, and (6 + 5 + 5) × 10 = 160, so SA = 184 square units.
Try a similar one
The prism is measured in meters. Each slanted side of the triangle is 5 meters. Find the surface area in square meters.
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
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Surface Area of Triangular Prisms — Easy Worksheet 1
Find each surface area: 2 triangles + 3 rectangles.