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Name the types of following triangles: (a) Triangle with lengths of sides 7 cm, 8 cm and 9 cm. (b) ∆ABC with AB = 8.7 cm, AC = 7 cm and BC = 6 cm. (c) ∆PQR such that PQ = QR = PR = 5 cm. (d) ∆DEF with ∠D = 90° (e) ∆XYZ with ∠Y = 90° and XY = YZ. (f) ∆LMN with ∠L = 30°, ∠M = 70° and ∠N = 80°

Solution (a) Scalene triangle (b) Scalene triangle (c) Equilateral triangle (d) Right angled triangle (e) Right angled isosceles triangle (f)... View Article

Fill in the blanks with acute, obtuse, right or straight: (a) An angle whose measure is less than that of a right angle is _____ (b) An angle whose measure is greater than that of a right angle is ____ (c) An angle whose measure is the sum of the measures of two right angles is _______ (d) When the sum of the measures of two angles is that of a right angle, then each one of them is _____ (e) When the sum of the measures of two angles is that of a straight angle and if one of them is acute then the other should be ______

Solution (a) An angle whose measure is less than that of a right angle is acute angle (b) An angle whose measure is greater than that of a... View Article