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Question

# Which of the following statements are true and which of them are false? (i) All squares are congruent. (ii) If two squares have equal areas, they are congruent. (iii) If two figures have equal areas, they are congruent. (iv) If two triangles are equal in area, they are congruent. (v) If two sides and one angle of a triangle are equal to the corresponding two sides and angle of another triangle, the triangle are congruent. (vi) If two angles and any side of a triangle are equal to the corresponding angles and the side of another triangle then the triangles are congruent. (vii) If three angles of a triangle are equal to the corresponding angles of another triangle then the triangles are congruent. (viii) If the hypotenuse and an acute angle of a right triangle are equal to the hypotenuse and the corresponding acute angle of another right triangle then the triangle are congruent. (ix) If the hypotenuse of a right triangle is equal to the hypotenuse of another right triangle then the triangles are congruent. (x) If two triangles are congruent then their corresponding sides and their corresponding angles are congruent.

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Solution

## (i) False This is because they can be equal only if they have equal sides. (ii) True This is because if squares have equal areas, then their sides must be of equal length. (iii) False For example, if a triangle and a square have equal area, they cannot be congruent. (iv) False For example, an isosceles triangle and an equilateral triangle having equal area cannot be congruent. (v) False They can be congruent if two sides and the included angle of a triangle are equal to the corresponding two sides and the included corresponding angle of another triangle. (vi) True This is because of the AAS criterion of congruency. (vii) False Their sides are not necessarily equal. (viii) True This is because of the AAS criterion of congruency. (ix) False This is because two right triangles are congruent if the hypotenuse and one side of the first triangle are respectively equal to the hypotenuse and the corresponding side of the second triangle. (x) True

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