Question

20 th one pls find fast

Answer 1

ans is 4 as area of triangle is half of 11gm and use .5 bh

Answer 2

since are of parallelogram is 16 so area of triangle DEC is 8 ( same base same parallel property)
AREA OF TRIANGLE DEC=1/2 *EC*DF
8=1/2*4*EC
EC=4