What is the area of a triangle whose base is 15 centimeters and whose height is 10 centimeters?

im having trouble understanding, explanation would be great thx : )

It should be easy.
Triangle area = (1 / 2) * base * height  (see attached graphic)
Triangle area = (1 / 2) * 15 * 10
Triangle area = (1 / 2) * 150
Triangle area = 75 square centimeters.

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The answer for you question is b