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Complementary & Supplementary Angles — Easy Worksheet 1
Grade 7 · MathSheets Name: ____________________ Date: __________
Find each missing value. Diagrams are drawn close to scale.
How to solve
Complementary angles add up to 90° (they make a right angle). Supplementary angles add up to 180° (they make a straight line). Subtract the angle you know from 90 or 180. If the angles are written with x, add them, set the sum equal to 90 or 180, and solve for x.
Example
Find the value of x.
Answer: 71
Not quite. The answer is
💡 The two angles make a right angle, so they are complementary and add to 90°. Subtract: x = 90 − 37 = 53.
✓ Correct!
Not quite. The answer is
💡 The two angles make a right angle, so they are complementary and add to 90°. Subtract: x = 90 − 37 = 53.
💡 How to solve: Complementary & Supplementary Angles
Complementary angles add up to 90° (they make a right angle). Supplementary angles add up to 180° (they make a straight line). Subtract the angle you know from 90 or 180. If the angles are written with x, add them, set the sum equal to 90 or 180, and solve for x.
Try a similar one
Find the value of x.
✓ 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
💡 The two angles make a straight line, so they are supplementary and add to 180°. Subtract: x = 180 − 54 = 126.
✓ Correct!
Not quite. The answer is
💡 The two angles make a straight line, so they are supplementary and add to 180°. Subtract: x = 180 − 54 = 126.
💡 How to solve: Complementary & Supplementary Angles
Complementary angles add up to 90° (they make a right angle). Supplementary angles add up to 180° (they make a straight line). Subtract the angle you know from 90 or 180. If the angles are written with x, add them, set the sum equal to 90 or 180, and solve for x.
Try a similar one
Find the value of x.
✓ 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
💡 The two angles make a right angle, so they are complementary and add to 90°. Subtract: x = 90 − 46 = 44.
✓ Correct!
Not quite. The answer is
💡 The two angles make a right angle, so they are complementary and add to 90°. Subtract: x = 90 − 46 = 44.
💡 How to solve: Complementary & Supplementary Angles
Complementary angles add up to 90° (they make a right angle). Supplementary angles add up to 180° (they make a straight line). Subtract the angle you know from 90 or 180. If the angles are written with x, add them, set the sum equal to 90 or 180, and solve for x.
Try a similar one
Find the value of x.
✓ 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
💡 The two angles make a straight line, so they are supplementary and add to 180°. Subtract: x = 180 − 150 = 30.
✓ Correct!
Not quite. The answer is
💡 The two angles make a straight line, so they are supplementary and add to 180°. Subtract: x = 180 − 150 = 30.
💡 How to solve: Complementary & Supplementary Angles
Complementary angles add up to 90° (they make a right angle). Supplementary angles add up to 180° (they make a straight line). Subtract the angle you know from 90 or 180. If the angles are written with x, add them, set the sum equal to 90 or 180, and solve for x.
Try a similar one
Find the value of x.
✓ 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
💡 An angle and its complement add to 90°. Subtract: 90 − 52 = 38°.
✓ Correct!
Not quite. The answer is
💡 An angle and its complement add to 90°. Subtract: 90 − 52 = 38°.
💡 How to solve: Complementary & Supplementary Angles
Complementary angles add up to 90° (they make a right angle). Supplementary angles add up to 180° (they make a straight line). Subtract the angle you know from 90 or 180. If the angles are written with x, add them, set the sum equal to 90 or 180, and solve for x.
Try a similar one
Find the value of x.
✓ 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
💡 An angle and its supplement add to 180°. Subtract: 180 − 135 = 45°.
✓ Correct!
Not quite. The answer is
💡 An angle and its supplement add to 180°. Subtract: 180 − 135 = 45°.
💡 How to solve: Complementary & Supplementary Angles
Complementary angles add up to 90° (they make a right angle). Supplementary angles add up to 180° (they make a straight line). Subtract the angle you know from 90 or 180. If the angles are written with x, add them, set the sum equal to 90 or 180, and solve for x.
Try a similar one
Find the value of x.
✓ 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
💡 Add the angles: 58 + 122 = 180°. Complementary angles add to 90° and supplementary angles add to 180°. That is 180°, so they are supplementary. The answer is Supplementary.
✓ Correct!
Not quite. The answer is
💡 Add the angles: 58 + 122 = 180°. Complementary angles add to 90° and supplementary angles add to 180°. That is 180°, so they are supplementary. The answer is Supplementary.
💡 How to solve: Complementary & Supplementary Angles
Complementary angles add up to 90° (they make a right angle). Supplementary angles add up to 180° (they make a straight line). Subtract the angle you know from 90 or 180. If the angles are written with x, add them, set the sum equal to 90 or 180, and solve for x.
Try a similar one
Find the value of x.
✓ 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
💡 The two angles make a straight line, so they are supplementary and add to 180°. Subtract: x = 180 − 43 = 137.
✓ Correct!
Not quite. The answer is
💡 The two angles make a straight line, so they are supplementary and add to 180°. Subtract: x = 180 − 43 = 137.
💡 How to solve: Complementary & Supplementary Angles
Complementary angles add up to 90° (they make a right angle). Supplementary angles add up to 180° (they make a straight line). Subtract the angle you know from 90 or 180. If the angles are written with x, add them, set the sum equal to 90 or 180, and solve for x.
Try a similar one
Find the value of x.
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
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Complementary & Supplementary Angles — Easy Worksheet 1
Find each missing value. Diagrams are drawn close to scale.