Mark the correct alternative in each of the following:
1. The sides of a triangle are 16 cm, 30 cm, 34 cm. Its area is
(a) 225 cm² 2. The base of an isosceles right triangle
(b) 240 cm²
(a) 225 cm²
(c) 225 √2 cm²
Its area is
is
30 cm. (b) 225 √3 cm² (c) 225 √2 cm²
3. The sides of a triangle are 7 cm, 9 cm and 14 cm. Its area is
(a) 12√5 cm²
(b) 12√3 cm²
(c) 24 √5 cm²
(d) 450 cm²
(d) 450 cm²
(d) 63 cm²
is
4. The sides of a triangular field are 325 m, 300 m and 125 m. Its area (a) 18750 m²
(b) 37500 m²
5. The sides of a triangle are 50 cm, 78
(b) 30 cm
(c) 97500 m²
and 112 cm. The (c) 40 cm
(d) 48750 m²
smallest altitude is (d) 50 cm
cm
(a) 20 cm 6. The sides of a triangle are 11 m, 60 m and 61 m. The altitude to the smallest side
(a) 11 m
(b) 66 m
(c) 50 m
(d) 60 m
is
7. The sides of a triangle are 11 cm, 15 cm and 16 cm. The altitude to the largest side in
(a) 30 √7 cm
15/7 2 (b) cm
(c) 15/7 4 cm
(d) 30 cm
8. The base and hypotenuse of a right triangle are respectively 5 cm and 13 cm long. Its a
is
(a) 25 cm²
(b) 28 cm²
(c) 30 cm²
(d) 40 cm²
9. The length of each side of an equilateral triangle of area 4√3 cm², is
(a) 4 cm
4 √3 (b) cm
(c) cm 4
10. If an isosceles right triangle has area 8 cm², then the length of its hypotenuse is
(a) √32 cm
(b) √48 cm (c) √24 cm
11. The perimeter of an equilateral triangle is 60 m. The area is
(a) 10/3 m²
(b) 15√3 m²
(c) 20/3 m²
(d) 4cm
12. The area of an isoscles triangle having base 2 cm and the length of one of the equal s 4 cm, is
(a) √15 cm²
√15 2 (b) cm
(c) 2√15 cm²
(d) 4/15 cm²
(d) 3 cm
(d) 100-/3 m²
13. The length of each side of an equilateral triangle having an area of 9/3cm² is
(a) 8 cm
(b) 36 cm
(c) 4 cm
(d) 6cm
Answers
Answered by
1
Answer:
options b
options c
options a
options a
options d
options c
bro please mark as best answer true
options d
Given sides of triangles are a=16cm,b=30cm,c=34cm respectively
Semiperimeter s=
2
16+30+34
cm
=
2
80
=40cm
By heron's, area of the triangle is
s(s−a)(s−b)(s−c)
cm
2
=
40(40−16)(40−30)(40−34)
cm
2
=
40×24×10×6
cm
2
=
4×10×4×6×10×6
cm
2
=4×6×10cm
2
=240cm
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