Advertisements
Advertisements
प्रश्न
Mark the correct alternative in each of the following:
If all the three angles of a triangle are equal, then each one of them is equal to
पर्याय
90°
45°
60°
30°
उत्तर
In a given ΔABC we are given that the three angles are equal. So, ∠A = ∠B = ∠C
According to the angle sum property of a triangle, in ΔABC
∠A + ∠B + ∠C = 180°
3∠A = 180°
∠A = 60°
∠A = ∠B = ∠C = 60°
Therefore, all the three angles of the triangle are equal to 60°
APPEARS IN
संबंधित प्रश्न
If the bisector of the exterior vertical angle of a triangle be parallel to the base. Show that the triangle is isosce
If the angles of a triangle are equal, find its angles.
Classify the following triangle according to sides:
The length of the sides of the triangle is given. Say what types of triangles they are 3.4 cm, 3.4 cm, 5 cm.
The length of the three segments is given for constructing a triangle. Say whether a triangle with these sides can be drawn. Give the reason for your answer.
17 cm, 7 cm, 8 cm
The length of the three segments is given for constructing a triangle. Say whether a triangle with these sides can be drawn. Give the reason for your answer.
8.4 cm, 16.4 cm, 4.9 cm
In the following figure, AD is the bisector of ∠BAC. Prove that AB > BD.
The image of an object placed at a point A before a plane mirror LM is seen at the point B by an observer at D as shown in the following figure. Prove that the image is as far behind the mirror as the object is in front of the mirror.
[Hint: CN is normal to the mirror. Also, angle of incidence = angle of reflection].
AB and CD are the smallest and largest sides of a quadrilateral ABCD. Out of ∠B and ∠D decide which is greater.
Can we have two acute angles whose sum is a right angle? Why or why not?
