Question

Ch: Perimeter and Area

Answer 1

(i) AREA= basexheight=7.5x5.6=42
(ii) area = basexheight
246=20Xheight
height= 12.3
(iii)area = b x h
154.5=15 x base
base= 10.3
(iv)area = b x h
48.72 = 8.4 x base
base = 5.8

Answer 2

hii!!

here's ur answer...

1. given base is 7.5cm and height is 5.6cm.

hence area of the parallelogram=b×h
=7.5×5.6
=42cm²

2. base is 20cm

area of the parallelogram=246cm²

therefore base×height=246cm²
→ 20×h=246cm²
→ h=246/20
→ h=12.3cm

verification:-

area of parallelogram=b×h
=20×12.3
=246cm²

hence verified

thus the height (altitude) of the parallelogram is 12.3cm.

3. height is 15cm

area of the parallelogram=154.5cm²
→ b×h=154.5cm²
→ b×15=154.5cm²
→ b=154.5/15
→ b=10.3cm

verification:-

area of parallelogram=b×h
=10.3×15
=154.5cm²

hence verified

thus the base of the parallelogram is 10.3cm

4. height is 8.4cm.

area of the parallelogram=48.72cm²

→ b×h=48.72cm²
→ b×8.4=48.72cm²
→ b=48.72/8.4
→ b=5.8cm

verification:-

area of the parallelogram=base×height

=5.8×8.4
=48.72cm²

hence verified

thus the base of the parallelogram is 5.8cm

hope this helps u..!