Question

18. Find the area of a triangle whose sides are 6cm , 4.5 cm and
4.5 cm.​

Answer 1

Answer:

since two sides are equal, it is an isosceles triangle...

area=4.5 cm²

Step-by-step explanation:

Let a=4.5cm ,a=4.5cm and b=6cm ..

[ Please have a sight on attached file ]

then, area of isosceles triangle =1/2 x base x height

area = 1/2 x b x √(a² – b²/2)

=1/2 x 6 x √(4.5²–6²/2)

= 3 x √(20.25 –36/2

=3 x √ ( 2.25)

=3 x 1.5

area=4.5 cm²

Hope this helps you.....!