Multiple choice

The length of the hypotenuse of a right triangle exceeds the length of the base by $2$ cm and exceeds twice the length of the attitude by $1$ cm. The perimeter of the triangle is:

  1. $18$ cm
  2. $17$ cm
  3. $25$ cm
  4. $40$ cm
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Let the altitude be h, the base be b, and the hypotenuse be c. The conditions give c = b + 2 and c = 2h + 1, so b = 2h - 1; applying the Pythagorean theorem gives h = 8, b = 15, and c = 17. The perimeter is 8 + 15 + 17 = 40 cm.