Lesson Worksheet: The Pythagorean Theorem Mathematics • 8th Grade

In this worksheet, we will practice using the Pythagorean theorem to find the length of the hypotenuse or a leg of a right triangle and its area.

Q1:

Find π‘₯ in the right triangle shown.

Q2:

Find the area of the triangle 𝐴𝐡𝐢, correct to one decimal place.

Q3:

Given that the triangle 𝐴𝐡𝐢 is right-angled at 𝐡, 𝐴𝐡=12cm, and 𝐡𝐢=5cm, find the length of 𝐴𝐢.

Q4:

Determine the length of the longest side of a right triangle if the lengths of the two other sides are 6 cm and 8 cm.

Q5:

Which of the relations below is correct?

  • A121=π‘₯+36
  • Bπ‘₯=6+11
  • Cπ‘₯=6+11
  • Dπ‘₯=(11+6)

Q6:

Given that 𝐴𝐡𝐢 is a right triangle, where 𝐢𝐡=8cm and 𝐴𝐢=10cm, determine the length of 𝐴𝐡.

Q7:

Find π‘₯ in the right triangle shown.

Q8:

Find π‘₯ in the right triangle shown.

Q9:

𝐴𝐡𝐢 is a right triangle at 𝐡, where 𝐴𝐡=40.3cm and 𝐡𝐢=39.6cm. Find the length of 𝐴𝐢.

Q10:

Determine the diagonal length of the rectangle whose length is 48 cm, and width is 20 cm.

Q11:

Determine, to the nearest tenth, the perimeter of a right triangle, given that its hypotenuse is 49 cm and that one of its sides is 26 cm.

Q12:

Given that 𝐴𝐡𝐢𝐷 is a square, find the length of 𝐷𝐸.

Q13:

Determine the area of 𝐴𝐡𝐢𝐷.

Q14:

Find π‘₯ in the right triangle shown.

Q15:

Find π‘₯ in the right triangle shown.

Q16:

Find π‘₯ in the right triangle shown.

Q17:

Find π‘₯ in the right triangle shown.

Q18:

Find π‘₯ in the right triangle shown.

Q19:

Find π‘₯ in the right triangle shown.

Q20:

Find π‘₯ in the right triangle shown.

Q21:

In a right triangle, which of the following is equal to the area of the square that has the hypotenuse as a side?

  • AThe sum of the areas of the squares drawn on the other two sides
  • BThe sum of the perimeters of the squares drawn on the other two sides
  • CThe area of the square drawn on one of the other two sides

Q22:

Find π‘₯ in the right triangle shown.

Q23:

A triangle has vertices at the points 𝐴(4,1),𝐡(6,2), and 𝐢(2,5).

Work out the lengths of the sides of the triangle. Give your answers as surds in their simplest form.

  • A𝐴𝐡=√5,𝐴𝐢=2√3, and 𝐡𝐢=√7
  • B𝐴𝐡=5,𝐴𝐢=5√2, and 𝐡𝐢=5
  • C𝐴𝐡=5,𝐴𝐢=4√2, and 𝐡𝐢=√7
  • D𝐴𝐡=√5,𝐴𝐢=2√5, and 𝐡𝐢=5
  • E𝐴𝐡=5,𝐴𝐢=5√2, and 𝐡𝐢=√5

Is the triangle a right triangle?

  • AYes
  • BIt is impossible to tell.
  • CNo

Q24:

Find π‘₯ in the right triangle shown.

Q25:

Find the length of the hypotenuse of a right triangle whose leg lengths are 1.

  • A√3
  • B3
  • C√2
  • D2
  • E1

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