Question 987308
Hi there,
If the size of PQ and PR = x
Area = 1/2 q*r*sin(40)
240 = 1/2 x * x * sin(40)
240 = 1/2 x^2 sin(40)
Multiply both sides by 2
480 = x^2sin(40)
Divide both sides by sin(40)
480/sin(40) = x^2
x = √480/sin(40)
x = 27.3cm
PR = PQ = 27.3cm
Hope this helps :-)