If the length of longest diagonal of a cube is 6 √3 cm. Find its surface area?
1). 236 cm2
2). 246 cm2
3). 256 cm2
4). 216 cm2
Longest Diagonal of a cube = a√3 = 6√3
⇒ a = 6 cm
⇒ Surface area of cube = 6 × a2 = 6 × 62
∴ 6 × 36 = 216 cm26. The diagonal of a right angle isosceles triangle is 5 cm. Its area will be