Square roots

Video on how to calculate square root
Please watch the video for understanding the process how we can use division method to get the square root of any given perfect square number. If you have understood how you can calculate square root here are few question to solve

1. 4225
2. 15625
3.  962361
4. 394384
5. 256036
6. 674041
7. 64144081

Check your answers :

1. 65
2. 125
3. 981
4. 628
5. 506
6. 821
7. 8009

triangles solution

Solutions triangles

Fill in the blanks

1.     Less than

2.     More than

3.     180^o

4.     Acute

5.     Obtuse

6.     60^o

Which triangles are feasibles

1.     6+1=7

The sum of two smaller side equal to third therefore it cannot be a triangle (Sum of two angles are always more than third side)

2.     3+2=5

5<6

The sum of two smaller side less than third therefore it cannot be a triangle (Sum of two angles are always more than third side)

3.     80+70+40= 190

Sum of three angles is not equal to 180^o. Therefore it cannot be a triangle.

4.     170+6+4=180

    Sum of three angles is equal to 180^o. Therefore it is a triangle.

Solve

1.     Right angle = 90

Given angle=30

90+30+ 3^rd angle=180

120+ 3^rd angle=180

3^rd angle= 180-120

3^rd angle = 60

2.     One of the equal angles =40

∠A+∠B+∠C=180

40+40+∠C=180

80+∠C=180

∠C=180-80

∠C=100

3.     Unequal angle of isosceles triangle=30

∠A+∠B+∠C=180

30+∠B+∠C=180

∠B+∠C=180-30

∠B+∠C=150

∠B=∠C=150/2

∠B=∠C=75

4.     ∠A+∠B+∠C=180

80+20+∠C=180

100+∠C=180

∠C=180-100

∠C=80

5.     Right angle= 90

Isosceles triangle= two other angles are equal

∠A+∠B+∠C=180

90+∠B+∠C=180

∠B+∠C=180-90

∠B+∠C=90

∠B=∠C=90/2

∠B=∠C=45

6.   

   

No of triangles= 32

Different ways in which the marked angle can be named:

∠ACE, ∠ACJ, ∠ACI

∠GCE, ∠GCJ, ∠GCI

∠HCI, ∠HCJ, ∠HCE

∠ICH, ∠ICG, ∠ICA

∠JCH, ∠JCG, ∠JCA

∠ECH, ∠ECG, ∠ECA

7. vertices- A, B, C

Sides- AB, BC, CA

Acute angles- ∠ABC, ∠ACB

Obtuse angles- ∠BAC

triangles questions

Triangle questions       class V

Fill in the blanks

1.  Acute angle is …………………… 90^o

2.   Obtuse angle is …………………….90^o

3.  Straight line measures…………………….

4.   Equilateral triangle is always………………………….(acute/obtuse)

5.    Other angles of Right triangle is never…………….…………….(acute/obtuse)

6.    Every angle of an equilateral triangle is……………………

Which triangles are feasible?

1.     1Sides – 6cm, 7cm, 1cm

2.     2Sides 6cm,3cm,2cm

3.     3Angles- 80^o, 70^o, 40^o

4.     4Angles – 170^o, 6^o, 4^o

Solve

1.     One angle of a right triangle is 30^o. Find the other angles.

2.     One of the equal angles of an isosceles triangle is 40. Find all the angles.

3.     The unequal angle of an isosceles triangle is 30. Find the other angles.

4.     Two angles of a triangle are 80 and 20. Find the third angle.

5.     Find the Angles of an isosceles right triangle.

6.     How many triangles are in the figure? In how many ways can the marked angle be named?              

     

                     

7.   Name the   a. vertices    b. sides

c. obtuse angles       d. acute angles. 

solutions in the next post


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