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Someone help me with c and d ? what formula / equations do i use?

Someone help me with c and d ? what formula / equations do i use?-example-1
User Azfar
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Answer:

Explanation:

You should use the formula of a triangle which is bh/2 and compare this formula to the formula of a parallelogram bh what do you see. Ask yourself the question of why are we dividing the area of a triangle by 2 and why are we not for the area of a parallelogram? And what makes up the parallelogram DBD'C? It helps if you draw it out.

User UncleAdam
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