Saved Bookmarks
| 1. |
the differece between the sides at right angles in a right angled triangle is 7cm . the area of the triangle is 60 cm square . find its perimeter. |
|
Answer» LET one side be x Other is x-7 Area of TRAINGLE = 1/2 * b * h = 0.5 * x * (x-7) = 60 Multiply both sides by 2 x*(x-7)=120 x^2 - 7x - 120 = 0 (x-15)(x+8)= 0 So x = 15 since x cant be negative x-7= 8 Using Pythagoras theorem, 64 + 225 = h*h h=17 Perimeter = 17+15+8 = 40cm |
|