CBSE Class 7 Mathematics Geometric Twins MCQs Set F

Question. For the RHS condition, the right angle must be
(a) 30 degrees
(b) 60 degrees
(c) 90 degrees
(d) 45 degrees

Answer: C

Question. When constructing the altitude AD in isosceles ΔABC (AB=AC), we find ΔADB ≅ ΔADC by which rule?
(a) SSS
(b) AAS
(c) RHS
(d) ASA

Answer: C

Question. In an equilateral triangle, we use the fact that angles opposite to equal sides are equal to show that
(a) Only two angles are equal
(b) All three sides are different
(c) All three angles are equal
(d) Perimeter is 180

Answer: C

Question. An equilateral triangle has all three sides equal. Therefore, all three angles must be
(a) 30 degrees
(b) 90 degrees
(c) 60 degrees
(d) 45 degrees

Answer: C

Question. If 3 x angle in an equilateral triangle = 180°, then one angle measure is
(a) 30°
(b) 120°
(c) 60°
(d) 45°

Answer: C

Question. If OB = OC and OA = OD, and we compare ΔAOB and ΔDOC, which congruence condition is likely to show ΔAOB ≅ ΔDOC?
(a) SSS
(b) AAS
(c) SAS
(d) RHS

Answer: C

Question. If ΔAOB ≅ ΔDOC, then ∠OAB and ∠ODC are corresponding angles. What can we say about them?
(a) They are complementary
(b) They are equal
(c) They are supplementary
(d) They are vertically opposite

Answer: B

Question. If ΔABC is isosceles (AB=AC) and ∠A = 120°, then ∠B and ∠C are equal. Their sum is
(a) 60°
(b) 120°
(c) 180°
(d) 90°

Answer: A

Question. If ΔABC is isosceles (AB=AC) and ∠A = 120°, then ∠B is equal to
(a) 40°
(b) 60°
(c) 30°
(d) 10°

Answer: C

Question. Two triangles need not be congruent if which measurements are equal?
(a) Three sides
(b) Two sides and a non-included angle
(c) Two angles and a side
(d) Two sides and the included angle

Answer: B

Question. If figures have same shape and same size, and they can fit exactly over each other, they are called
(a) Similar
(b) Proportional
(c) Congruent
(d) Identical in appearance only

Answer: C

Question. When checking if two figures are congruent, we are allowed to rotate or flip one figure before we superimpose it. This is true or false?
(a) False
(b) True
(c) True only for triangles
(d) True only for circles

Answer: B

Question. To get the exact copy of the symbol with arm lengths AB and BC, the measure of which angle is also needed?
(a) Angle ACB
(b) Angle BAC
(c) Angle ABC
(d) Angle BCA

Answer: C

Question. Figures that are exact copies of each other are said to be
(a) Equilateral
(b) Similar
(c) Congruent
(d) Identical in shape only

Answer: C

Question. When checking for congruence, a figure can be manipulated how before superimposing?
(a) Only enlarged
(b) Only shrunk
(c) Rotated or flipped
(d) Made opposite

Answer: C

Question. If two congruent figures are superimposed exactly, one over the other, they will
(a) Look similar
(b) Have same shape but different size
(c) Fit exactly
(d) Have equal area only

Answer: C

Question. If two symbols have same arm lengths but different angles between them, they are
(a) Congruent
(b) Non-congruent
(c) Always squares
(d) Always isosceles

Answer: B

Question. To create a figure congruent to a given circle, the measurement we need is
(a) Diameter
(b) Area
(c) Radius
(d) Circumference

Answer: C

Question. Meera said that the sidelengths of a triangle are enough to construct a congruent triangle, this is
(a) Wrong
(b) Right
(c) Only true for small triangles
(d) True only if angles are 90 degrees

Answer: B

Question. If triangle ABC is congruent to triangle XYZ (written as triangle ABC ≅ triangle XYZ), then angle C and angle Z are
(a) Different angles
(b) Corresponding angles
(c) Vertically opposite angles
(d) Opposite sides

Answer: B