One triangle is similar to another if the angles of one are the same as the angles of the other. Since the three angles must sum to 180, it is enough that two of the angles of one triangle are the same as the corresponding two of the other. Equivalently, the three corresponding sides of the two triangles must be in the same proportion.
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triangle
It is a triangle similar to the original but quarter the size.
Rectangle has 4 sides, and triangle has 3 sides. So they are similar, they both have sides - one has more than the other :)
the area of a triangle is half of the base times the height the area of a triangle is half of the base times the height
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