You can make the triangle any shape you like, and you also have
a lot of choices of how big to make it.
Just make sure that the product of
(length of the triangle's base) times (height of the triangle)
multiplies to 30. Then you'll know that its area is 15.
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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.
A right-angle triangle is half of a square or rectangle. Draw a square or rectangle and draw a line from one corner to the corner diagonally opposite. You now have two triangles of the same area.
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.
Yes
To find the area of a square, you multiple the length of the side by itself. So a square with sides 3 inches long has an area of 3 x 3 = 9 square inches. (Draw a diagram if you need convincing!)