Advertisements
Advertisements
प्रश्न
Find the area of a triangle, whose sides are :
18 mm, 24 mm and 30 mm
Advertisements
उत्तर
Sides of ∆ are
a = 18 mm
b = 24 mm
c = 30 mm
S = `(a + b + c)/2 = (18 + 24 + 30)/2`
= `72/2 = 36`
area of Δ = `sqrt(S(S - a)(S - b)(S - c))`
= `sqrt(36(36 - 18)(36 - 24)(36 - 30))`
= `sqrt(36 xx 18 xx 12 xx 6)`
= `sqrt(18 xx 2 xx 18 xx 2 xx 6 xx 6)`
= `sqrt(18 xx 18 xx 2 xx 2 xx 6 xx 6)`
= `18 xx 2 xx 6 = 216 "mm"^2`
APPEARS IN
संबंधित प्रश्न
Calculate the area and the height of an equilateral triangle whose perimeter is 60 cm.
Find the area of an isosceles triangle with perimeter is 36 cm and the base is 16 cm.
Find the area of a triangle, whose sides are :
21 m, 28 m, and 35 m
A field is in the shape of a quadrilateral ABCD in which side AB = 18 m, side AD = 24 m, side BC = 40m, DC = 50 m and angle A = 90°. Find the area of the field.
The altitude and the base of a triangular field are in the ratio 6: 5. If its cost is ₹ 49,57,200 at the rate of ₹ 36,720 per hectare and 1 hectare = 10,000 sq. m, find (in metre) dimensions of the field.
Use the information given in the adjoining figure to find :
(i) the length of AC.
(ii) the area of an ∆ABC
(iii) the length of BD, correct to one decimal place.
Find the area of a right angled triangle whose hypotenuse is 15cm and the base is 9cm.
The table given below contains some measures of the triangle. Find the unknown values.
| Side 1 | Side 2 | Side 3 | Perimeter |
| 11 feet | ? | 9 feet | 28 feet |
Find the perimeter and the area of a right angled triangle whose sides are 6 feet, 8 feet and 10 feet
In the following figure, all triangles are equilateral and AB = 8 units. Other triangles have been formed by taking the mid points of the sides. What is the perimeter of the figure?
