21. The sides of a triangle are 70 cm, 80 cm and 90 cm. Find it area.
Answers
Answered by
1
Answer:
A=70cm
B=80cm
C=90cm
Semi-perimeter =
2
(70+80+90)
=
2
240
=120cm
Area of triangle =
s(s−a)(s−b)(s−c)
=
120(120−70)(120−80)(120−90)
=
120×50×40×30
=
4×3×10×5×10×3×10×4×10
=4×3×100
5
=1200×2.23
=1200×
100
223
=2676cm
2
∴ Area of triangle =2676cm
2
Answered by
1
Answer:
∴ Area of triangle =2676cm2 = 2676 c m 2 .
Step-by-step explanation:
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