the side of triangle is 5/7 cm.the perimeter of the triangle is
Answers
Answered by
0
Answer:
15/7 cm
Step-by-step explanation:
perimeter=sum of all sides
=5/7+5/7+5/7
=15/7 cm
Answered by
0
Answer: 60
3
cm
2
.
Step-by-step explanation: Correct option is A)
Given sides in the ratio 3:5:7
perimeter of the triangle =60cm
3x+5x+7x=60
⇒15x=60
⇒x=60/15
⇒x=4
3x=3×4=12cm
5x=5×4=20cm
7x=7×4=28cm
Let S be the semiperimeter of given triangle.
S=
2
1
(a+b+c)
=
2
1
⋅60
=30
Now use formula foe area of triangle
Area =
30(30−12)(30−20)(30−28)
=
30⋅18⋅10⋅2
=
60⋅180
=
10800
=
3600⋅3
=60
3
cm
2
∴ Area of triangle =60
3
cm
2
.
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