Find a missing side of a right triangle

Answer Key - Grade 8 Math Worksheet - Building Confidence

Circle the best answer, or write your answer on the line.

1. 1.

   Ari cuts a right triangle from card paper for an art project. How long is the hypotenuse, in inches?

   40
2. 2.

   Bo's drawing robot draws a right triangle and then beeps very proudly. How long is the hypotenuse, in cm?

   10
3. 3.

   Esme's class marks out a right-triangle flower bed with string. How long is the hypotenuse, in feet?

   35
4. 4.

   Kira draws a right triangle on poster paper but forgets to label one leg. How long is that leg, in feet?

   8
5. 5.

   Milo's math book shows a right triangle with one leg missing its label. How long is that leg, in cm?

   8
6. 6.

   Noah draws a long, thin right triangle with a crayon. How long is the unlabeled leg, in cm?

   7
7. 7.

   Pia lays a right triangle of foam tiles on the gym floor. How long is the unlabeled leg, in inches?

   12
8. 8.

   Tala labels a right triangle in pencil and needs the hypotenuse next. Which first step is right?

   • Add the sides: 11 + 60
   • Add the squares: 11² + 60²
   • Subtract the squares: 60² − 11²
9. 9.

   Zee's garden plan shows a right-triangle bed with one leg unlabeled. Which first step finds that leg?

   • Add the squares: 9² + 15²
   • Subtract the squares: 15² − 9²
   • Subtract the sides: 15 − 9, and stop there
10. 10.

    Ari's robot shows a right triangle and blinks at the missing leg. Which first step finds that leg?

    • Add the squares: 10² + 26²
    • Subtract the sides: 26 − 10
    • Subtract the squares: 26² − 10²