Question

find the area of the parrallogram​

Answer 1

Answer:

I believe you meant trapezium, not parallelogram, in that case, here's the answer:

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Draw a line segment DE // AB

AB // DE and AD // BE

Therefore ABED is a parallelogram

Area of ABED = 13cm x 10cm = 130 cm^2

In triangle CDE,

Area of triangle (by Heron's formula):

$\sqrt{s(s - a)(s - b)(s - c)}$

$\sqrt{21 \times 8 \times 7 \times 6}$

$84 \: cm {}^{2}$

Area of trapezium = 130 + 84 = 214 cm^2