2a = 35
a = 35/2
a = 17.5
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One side of the square, RA, is 2a cm. So the area of the square is (2a)2 = 4a2 cm2
What is 18 divded 5
2a + 3a = 5a
A = h/2*(a + b) So 2A/h = a + b and therefore, a = 2A/h - b
2*9 - 5 = 18 - 5 = 13