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    Exercise 5.6

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6th class > > Exercise 5.6

Exercise 5.6

1.Name the types of following triangles.

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

(b) ΔABC with AB = 8.7 cm, AC = 7 cm and BC = 6 cm : .

(c) ΔPQR such that PQ = QR = PR = 5 cm : .

(d) ΔDEF with m∠D = 90° : .

(e) ΔXYZ with m∠Y = 90° and XY = YZ : .

(f) ΔLMN with m∠L = 30°, m∠M = 70° and m∠N = 80° : .

 2. Match the following :
3 sides of equal length
2 sides of equal length
All sides are of different length
3 acute angles
1 right angle
1 obtuse angle
1 right angle with two sides of equal length
Scalene
Isosceles right angled
Obtuse angled
Right angled
Equilateral
Acute angled
Isosceles
 3. Name each of the following triangles in two different ways: (you may judge the nature of the angle by observation).

4. Try to construct triangles using match sticks. Some are shown here.Can you make a triangle with.

(Remember you have to use all the available matchsticks in each case)Name the type of triangle in each case.If you cannot make a triangle, think of reasons for it.And Answer in the form of Yes or No.

(a) 3 matchsticks?

(b) 4 matchsticks?

: .

(c) 5 matchsticks?

.

(d) 6 matchsticks?

: .