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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 $m\angle N=80^{\circ}$

Answers (1)

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(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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