Question 2 Match the following $\begin{matrix} Measure of Triangle & Types of triangle 3 sides of equal length & Scalene 2 sides of equal length & Isosceles right angle All sides are of different length & Obtuse angle 3 acute angles & Right angle 1 right angle & Equilateral 1 obtuse angle & Acute angle 1 right angle with two sides of equal Length & Isosceles \end{matrix}$

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$\begin{matrix} Measure of Triangle & Types of triangle 3 sides of equal length & Equilateral 2 sides of equal length & Isosceles All sides are of different length & Scalene 3 acute angles & Acute angle 1 right angle & Right angle 1 obtuse angle & Obtuse angle 1 right angle with two sides of equal Length & Isosceles right angle \end{matrix}$

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Question 2

Match the following
$\begin{matrix} M e a s u r e o f T r i a n g l e & T y p e s o f t r i a n g l e 3 s i d e s o f e q u a l l e n g t h & S c a l e n e 2 s i d e s o f e q u a l l e n g t h & I s o s c e l e s r i g h t a n g l e A l l s i d e s a r e o f d i f f e r e n t l e n g t h & O b t u s e a n g l e 3 a c u t e a n g l e s & R i g h t a n g l e 1 r i g h t a n g l e & E q u i l a t e r a l 1 o b t u s e a n g l e & A c u t e a n g l e 1 r i g h t a n g l e w i t h t w o s i d e s o f e q u a l L e n g t h & I s o s c e l e s \end{matrix}$

Question 7

Lengths of sides of a triangle are 3 cm, 4 cm and 5 cm. The triangle is

a) Obtuse-angled triangle
b) Acute angled triangle
c) Right angled triangle
d) An isosceles right triangle.

Q. Complete the following table:

Shapes	Rough Figure	Number of lines of symmetry
(i) Scalene triangle		0
(ii) Isosceles triangle		1
(iii) Equilateral triangle
(iv) Rectangle
(v) Square
(vi) Parallelogram
(vii) Rhombus
(viii) Line
(ix) Line segment
(x) Angle
(xi) Isosceles trepezium
(xii) Kite
(xiii) Arrow-head
(xiv) Semi-circle
(xv) Circle
(xvi) Regular pentagon
(xvii) Regular hexagon

Match the following:

$\begin{matrix} Quadrilateral & Properties 1. Trapezium & A) A parallelogram, where diagonals bisect at right angles, all sides are equal and none of the angles are equal to 90^{\circ} 2. Square & B) A quadrilateral, where only one pair of opposite sides is parallel and unequal 3. Rectangle & C) A parallelogram, where diagonals are equal, all sides equal and all the angles are 90^{\circ} 4. Rhombus & D) A parallelogram, where diagonals and opposite sides are equal, and all the angles are 90^{\circ} \end{matrix}$

In the given figure, $△ A B C$ ~ $△ B D C$ . Identify the equal angles in the triangles.

$\begin{matrix} 1. ∠ D B C = □ & A : ∠ B C A 2. ∠ B D C = □ & B : ∠ B A C 3. ∠ D C B = □ & C : ∠ A B C \end{matrix}$

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Types of Triangles Based on Lengths of Sides

Standard VI Mathematics

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Measure of Triangle Types of triangle3 sides of equal lengthEquilateral2 sides of equal length IsoscelesAll sides are of different lengthScalene3 acute angles Acute angle1 right angle Right angle1 obtuse angle Obtuse angle1 right angle with two sides of equal Length Isosceles right angle