Mathematics
Name each of the following triangles in two different ways (you may use ruler and protractor):
Triangles
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Answer
On measuring the sides and angles of each triangle using ruler and protractor, we get:
(i) The triangle has 2 same sides and one side is different and one angle is obtuse (greater than 90°).
∴ It is an isosceles obtuse-angled triangle.
(ii) The triangle has all three sides different and one angle is a right angle (90°).
∴ It is a scalene right-angled triangle.
(iii) The triangle has two sides equal and all three angles are acute (less than 90°).
∴ It is an isosceles acute-angled triangle.
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Related Questions
Classify the angles whose measures are given below:
(i) 56°
(ii) 125°
(iii) 90°
(iv) 180°
(v) 215°
(vi) 328°
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(ii) ΔPQR with PQ = RP = 5 cm and QR = 7.3 cm.
(iii) ΔDEF with ∠D = 90°.
(iv) ΔXYZ with ∠Y = 90° and XY = YZ.
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(i) A rectangle is a regular quadrilateral.
(ii) A rhombus is a regular quadrilateral.
(iii) Every parallelogram is a rhombus.
(iv) The diagonals of a rhombus intersect at right angles.
(v) A polygon having 6 sides is called an octagon.
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