Question

the average length of 3 side of a triangle is 19 cm ,What is its perimetre​

Answer 1

Answer:

Area of triangle with sides a, b,and c and s =

2

a+b+c

is

s(s−a)(s−b)(s−c)

.

For triangle with sides 16 cm, 12 cm and 20 cm, s=

2

16+12+20

=24cm

Area of the triangle with sides 16 cm, 12 cm and 20 cm =

24(24−16)(24−12)(24−20)

=

24×8×12×4

=

8×3×8×4×3×4

=8×3×4=96cm

2

Area of triangle can also be calculated using the formula

2

1

×base×height

Let the height for base 12cm, be h.

So, area =

2

1

×12×h=96cm

2

=>h=16cm

Answer 2

Step-by-step explanation:

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