The material needed to make 1 kite is 144 square inches and for 3 kites she need 432 square inches of the material.
Explanation:
Diagonals of the kite = 16 inches and 18 inches
Area of the kite = (16 x 18) /2
= 144 square inches
Area of 3 kites = 3 x 144
= 432 square inches.
The material needed to make 1 kite is 144 square inches and for 3 kites she need 432 square inches of the material.