Respuesta :

georgytom8flames

Step-by-step explanation:

apply Pythagorean theorem. if a^2 + b^2 = c^2 then

b = √(15^2 - 9^2) = 12.

12 is answer

AikoMikan

Hey there!

Solve using pythagoras theorem (it's given that is triangle is right angled. Pythagoras theorem only works in the case of right triangles) ⇨ Hypotenuse² = Base² + Altitude ²

Here,

Base = 9 mm

Hypotenuse = 15 mm

Altitude = b

Hypotenuse² = Base² + Altitude ²

15² = 9² + b²

225 = 81 + b²

225 - 81 = b²

144 = b²

√144 = b

12 mm = b

Hope it helps ya!