Question

proof of area of triangle is 1/2bh

Answer 1

As we know area of the parallelogram=base × altitude=CD×ALand the diagonal of parallelogram , divides it in two equal parts So, area of triangle ABC= area of triangle ADC=12area of the parallelogram,ABCD⇒area of triangle ADC=12×CD×AL⇒area of triangle ADC=12×base×heightHence Proved.

Answer 2

Answer:

Width of picture = 60cm

Length of picture = 1.8m=180cm

Perimeter of the picture ⟹2×(length+breadth)

⟹2×(180+60)cm=2×240cm=480cm

Ratio=Perimeter of picturewidth of picture=48060=81=1:8

Answer 3

Answer:

Width of picture = 60cm

Length of picture = 1.8m=180cm

Perimeter of the picture ⟹2×(length+breadth)

⟹2×(180+60)cm=2×240cm=480cm

Ratio=Perimeter of picturewidth of picture=48060=81=1:8