How to get rid of soil mitesAns. Given, length of two equal sides of an isosceles triangle = a = 5 cm. And length of its base = b = 6 cm. Perimeter of an isosceles triangle = 2a + b. = 2 (5) + 6. = 10 + 6 = 16 cm. Q.2. If the Base and Area of an Isosceles Triangle are 8 cm and 12 cm2 respectively. Then find its perimeter. Motorola xt1028 activation bypassWe start with this formula: Area = ½ × base × height. We know the base is c, and can work out the height: the height is b × sin A. So we get: Area = ½ × (c) × (b × sin A) Which can be simplified to: Area = 1 2 bc sin A. By changing the labels on the triangle we can also get: