Question

Given that a = 5 cm and b = 4.2 cm, work out the perimeter of the triangle.

Give your answer rounded to 1 DP.

Answer 1

15.7 cm

Is it a right triangle?

If so we can use Pythagorean Therom:

a^2+b^2=c^2

Solve for c by plugging in a and b

You get c≈6.529931

Perimeter is the sun of all of the sides so just add em together:

6.5+5+4.2= 15.7 cm