Answer:
67.5cm^2
Step-by-step explanation:
area of a triangle is 0.5xaxb
answer : 54cm^2
pythagorus’ theorum : a^2 + b^2 = c^2
so 9^2 + x^2 = 15^2, x being the missing length
work out x ...
81 + x^2 = 225
x^2 = 144
x = 12
area of a triangle : 0.5 x base x height
so 0.5 x 9 x 12 = 54
