Practice MCQ Questions and Answer on Triangles
121.
G is the centroid of ÃÂÃÂÃÂÃÂÃÂÃÂABC. If AB = BC = AC, then measure of ÃÂÃÂÃÂâÃÂÃÂÃÂÃÂÃÂàBGC is:
- (A) 45°
- (B) 60°
- (C) 90°
- (D) 120°
122.
The angle between the external bisectors of two angles of a triangle is 60ÃÂÃÂÃÂð. Then the third angle of the triangle is
- (A) 40°
- (B) 50°
- (C) 60°
- (D) 80°
123.
In an isosceles triangle ÃÂÃÂÃÂÃÂÃÂÃÂABC, AB = AC and ÃÂÃÂÃÂâÃÂÃÂÃÂÃÂÃÂàA = 80ÃÂÃÂÃÂÃÂÃÂÃÂÃÂð. The bisector of ÃÂÃÂÃÂâÃÂÃÂÃÂÃÂÃÂàB and ÃÂÃÂÃÂâÃÂÃÂÃÂÃÂÃÂàC meet at D. The ÃÂÃÂÃÂâÃÂÃÂÃÂÃÂÃÂàBDC is equal to.
- (A) 90°
- (B) 100°
- (C) 130°
- (D) 80°
124.
The orthocenter of a triangle is the point where?
- (A) The medians meet
- (B) The altitudes meet
- (C) The right bisectors of the sides of
- (D) The bisectors of the angles
125.
In case of an acute angled triangle, its orthocenter lies:
- (A) Inside the triangle
- (B) Outside the triangle
- (C) On the triangle
- (D) On one of the vertex of the triangle
126.
O is the incentre of ÃÂÃÂÃÂÃÂÃÂÃÂABC and ÃÂÃÂÃÂâÃÂÃÂÃÂÃÂÃÂàA = 30ÃÂÃÂÃÂÃÂÃÂÃÂÃÂð, then ÃÂÃÂÃÂâÃÂÃÂÃÂÃÂÃÂàBOC is
- (A) 100°
- (B) 105°
- (C) 110°
- (D) 90°
127.
The side QR of an equilateral triangle PQR is produced to the point S in such a way that QR = RS and P is joined to S. Then the measure of ÃÂÃÂÃÂâÃÂÃÂÃÂÃÂÃÂàPSR is
- (A) 30°
- (B) 15°
- (C) 60°
- (D) 45°
128.
In triangle PQR, points A, B and C are taken on PQ, PR and QR respectively such that QC = AC and CR = CB. If ÃÂÃÂÃÂâÃÂÃÂÃÂÃÂÃÂàQPR = 40ÃÂÃÂÃÂÃÂÃÂÃÂÃÂð, then ÃÂÃÂÃÂâÃÂÃÂÃÂÃÂÃÂàACB is equal to:
- (A) 140°
- (B) 40°
- (C) 70°
- (D) 100°
129.
The equidistant point from the vertices of a triangle is called its:
- (A) Centroid
- (B) Incenter
- (C) Circumcenter
- (D) Orthocenter
130.
For a triangle ABC, D, E, F are the mid - point of its sides. If ÃÂÃÂÃÂÃÂÃÂÃÂABC = 24 sq. units then ÃÂÃÂÃÂÃÂÃÂÃÂDEF is :
- (A) 4 sq. units
- (B) 6 sq. units
- (C) 8 sq. units
- (D) 12 sq. units