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.

   Jun sews a right-triangle quilt patch. How long is the hypotenuse of the patch, in inches?

   13
3. 3.

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

   8
4. 4.

   Luz cuts a right triangle out of felt. The scissors are extra sharp today. How long is the unlabeled leg, in inches?

   12
5. 5.

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

   7
6. 6.

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

   12
7. 7.

   Ren must find the hypotenuse of a right triangle drawn on paper. Which first step is right?

   • Subtract the squares: 36² − 15²
   • Add the sides: 15 + 36
   • Add the squares: 15² + 36²
8. 8.

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

   • Subtract the squares: 60² − 11²
   • Add the sides: 11 + 60
   • Add the squares: 11² + 60²
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 sides: 15 − 9, and stop there
   • Subtract the squares: 15² − 9²
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