Advertisements
Advertisements
प्रश्न
The perimeter of an equilateral triangle is 30 cm. The area is
पर्याय
`10sqrt(3) "cm"^2`
`12sqrt(3) "cm"^2`
`15sqrt(3) "cm"^2`
`25sqrt(3) "cm"^2`
Advertisements
उत्तर
`25sqrt(3) "cm"^2`
Explanation;
Hint:
Perimeter of an equilateral triangle = 30 cm
3a = 30 cm
a = `30/3`
= 10 cm
Area of an equilateral triangle = `sqrt(3)/4 "a"^2 "sq.units"`
= `sqrt(3)/4 xx 10 xx 10`
= `25sqrt(3) "cm"^2`
APPEARS IN
संबंधित प्रश्न
The perimeter of a triangular field is 240 dm. If two of its sides are 78 dm and 50 dm, find the length of the perpendicular on the side of length 50 dm from the opposite vertex.
Find the areas of the given plot. (All measures are in metres.)
Find the area of the triangle formed by the points
(1, – 1), (– 4, 6) and (– 3, – 5)
Determine whether the sets of points are collinear?
`(-1/2, 3), (-5, 6) and (-8, 8)`
A man walks near a wall, such that the distance between him and the wall is 10 units. Consider the wall to be the Y-axis. The path travelled by the man is
The perimeter of a triangular plot is 600 m. If the sides are in the ratio 5 : 12 : 13, then find the area of the plot
Find the area of the unshaded region
The semi-perimeter of a triangle having sides 15 cm, 20 cm and 25 cm is
The perimeter of a triangular field is 420 m and its sides are in the ratio 6 : 7 : 8. Find the area of the triangular field.
The sides of a quadrilateral ABCD are 6 cm, 8 cm, 12 cm and 14 cm (taken in order) respectively, and the angle between the first two sides is a right angle. Find its area.
