Question

step by step explanation​

Answer 1

Answer:

area of equilateral triangle =√3/4a^2

Step-by-step explanation:

43.3cm

Answer 2

Answer:

option d (none of these)

Step-by-step explanation:

consider the sides of triangle as A, O ,C

AC^2 = OC^2+ AO^2

10^2 = 5^2 + AO^2

100 = 25 + AO^2

100-25 = AO^2

75 = AO^2

AO = √75

AO = 8.6

THEREFORE:

AREA = 1/2 B*H

1/2 *10 *8.6

Calculate it

43cm^2

it matches with none of the options so it is optionD