Question

Can u pls tell how this underlined step i couldn't understand
The question is
Two circular flower beds have been shown on two sides of square lawn ABCD of side 56m if the center of each circular flower bed is the point of intersection O of the diagonals of the square lawn find the sum of the areas of the lawn and the flower bed

Answer 1

triangle oab is equilateral nd 90 deg so in tht step we need to find the area of tht..and uk tht area of triangle is 1/2bh. but for right triangle udh to find height or anything just substitute the value of the altitude and base.