Question

Find the area of isoceles triangle whose perimeter is 11cm and base is 5cm

Answer 1

let equal sides be x 
2x+4=11
2x= 7
x=3.5
hieght²=hypotenuse ²- base²
hieght²=16.25
hieght=√16.25
area= 4*√16.25/2
2√16.25