Question

4. ABCD is a parallelogram. DE is the height from D to AB and DF is the height from D to BC.
If AB = 12 cm, DE = 10cm and DF = 8 cm. Find the length of BC.​

Answer 1

Answer:

15

Step-by-step explanation:

first find area of parallelogram taking base AB

area = 12×10=120

now takd BC as base

area = base × corresponding altitude

120 = Bc × 8

120÷8 = BC

BC = 15 cm

Answer 2

Answer:

area of parallelogram =base ×height

height =10cm

base =12 cm

area =( 12 ×10 ) 120cm square .

DF us the height on BC

let the length of BC be x

ATP

b×h = 120

8x = 120

x = 15 cm ..

ans length of BC is 15 cm