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3. Name each of the following triangles in two different ways: (you may judge the nature of the angle by observation)

            

(a)(i) Acute angled triangle.     (ii) Isosceles triangle. (b)(i) Right angled triangle.     (ii) Scalane triangle. (c)(i) Obtuse angled triangle.     (ii) Isosceles triangle. (d)(i) Right angled triangle.     (ii) Isosceles triangle. (e)(i) Acute angled triangle.     (ii) Equilateral triangle. (f)(i) Obtuse angled triangle.    (ii) Scalane triangle.      

2. Match the following :         

Measure of triangles Types of triangle
(i) 3 sides of equal length (a) Scalene
(ii) 2 sides of equal length (b) Isoscles right angled 
(iii) All sides of different length (c) Obtuse angled
(iv) 3 acute angles (d) Right angled 
(v) 1 right angle (e) Equilateral
(vi) 1 obtuse angle (f) Acute angled
(vii) 1 right angle with two sides of equal length (g) Isosceles

 

Measure of triangles Types of triangle (i) 3 sides of equal length (e)Equilateral (ii) 2 sides of equal length (g) Isoscles (iii) All sides of different length (a) Scalene (iv) 3 acute angles (f) Acute angled   (v) 1 right angle (d)Right angled (vi) 1 obtuse angle (c) Obtuse angled (vii) 1 right angle with two sides of equal length (b) Isoscles right angled

1.  Name the types of following triangles :

            (a) Triangle with lengths of sides 7 cm, 8 cm and 9 cm.

            (b) \Delta ABC with AB = 8.7 cm, AC = 7 cm and BC = 6 cm.

            (c) \Delta PQR such that PQ = QR = PR = 5 cm.

            (d) \Delta DEF with m\angle D=90^{\circ}

            (e) \Delta XYZ with m\angle Y=90^{\circ} and XY = YZ.

            (f) \Delta LMN with m\angle L=30^{\circ}, m\angle M=70^{\circ} and m\angle N=80^{\circ}

(a) Scalane Triangle. (b) Scalane Triangle. (c) Equilateral Triangle. (d) Right angled Triangle. (e) Right angled isosceles Triangle. (f) Acute angled Triangle.
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