13.The area of a triangle whose sides are 6 cm, 8 cm and 10 cm is.
14. The parallel sides of a trapezium are 6 the radius of the circle inscribed in an equilateral triangle with side 6cm is m root3 cm. then m= 8 cm. The distance between them is 4 cm. Its area is.
15. The diagonal of a quadrilateral is 10 cm. The lengths of the perpendiculars drawn on this diagonal from opposite vertices are 5 cm and 4 cm. The area of the quadrilateral is.
16. The area of a triangle whose sides are 13 cm, 14 cm and 15 cm is.
Answers
Answered by
1
Answer:
Given : ABC is equilateral triangle.
OC= radius of cicle. ∠ACP=60
∘
BC=6cm (Given) ∠OCP=
2
∠ACP
=30
∘
.
PC=
2
BC
=3cm
in ΔOPC :-
cos∠OCP=
OC
PC
⇒cos30
∘
=
OC
PC
⇒
2
3
=
OC
3
⇒OC=2
3
cm
∴ Radius of circle OC=2
3
cm
Answered by
0
Answer:
Ans 13- (1/2)×6×8=24cm^2
Ans 15- 60 cm^2
Ans 16- a=13,b=14 and c=15
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