Question

in the figure ABCD is a square. the triangle at the four corners are congruent . find the area and the perimeter of the shaded region.​

Answer 1

Answer:

Area of full square = 20 x 20 = 400 m square.

area of one triangle

formula

$1 \div 2 \times x \times x$

side 3

$1 \div 2 \times 3 \times 3$

$= 9 \div 2$

area of four same triangle =

$4 \times 9 \div 2$

$36 \div 2 = 18$

area of shaded portion

$400 - 18$

$382$

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