Find two numbers that multiply to twice the number, that is. to 30. Say 3 and 10.
Draw a right angled triangles whose legs are 3 inches and 10 inches. Its area will be 15 sq inches - as required.
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The area is: 15.6 (15.58846) square inches.
20 inches Check: 1/2*3*20 = 30 square inches
There are many different triangles that have an area of three square inches, here's one way to draw one: Draw a rectangle whose area is six square inches (or imagine what one's dimensions would be, e.g. 6x1 or 3x2) and cut it in half diagonally to make a right triangle that has an area of three square inches.
The area of triangle is : 42.0
35 square inches