Nishan ,jagtar ,gurmeet Verka(b) Amritsar

CONSTRUCTION AND PROPERTIES OF

TRIANGLE

BY GURMEET**9TH C JAGTAR**9TH C NISHAN**9TH C

 TRIANGLE IS A CLOSED FIGUREBOUNDED BY THREE LINE SEGMENTS

A

B

C Triangle

SCALENE TRIANGLE ISOSCELES TRIANGLE EQUILATERAL TRIANGLE

SCALENE TRIANGLE. IF ALL THE THREE SIDES OF ATRIANGLE ARE UNEQUAL, IT IS CALLED A SCALENE TRIANGLE

A

B

C AB=BC=CA SCALENE TRIANGLE

IF ANY TWO SIDES OF A TRIANGLE ARE EQUAL, IT IT CALLED AN ISOSCELES TRIANGLE.

A

B

C AB = AC ISOSCELES TRIANGLE

IF ALL THE THREE SIDES OF A TRIANGLE ARE EQUAL, IT IS CALLED AN EQUILATERAL TRIANGLE

A

C

B AB =BC =CA EQUILATERAL TRIANGLE

THE SUM OF THREE ANGLES OF A TRIANGLE IS 1800 A TRIANGLE ABC. ∟A + ∟B + ∟C = 1800 A

B

E

C

D

IF A SIDE OF A TRIANGLE IS PRODUCET, THE EXTERIOR ANGLE SO FORMET IS EQUAL TO THE SUM OF TWO INTERIOR ANGLE

∟ACD =∟A + ∟B . A

B

C

C

D

Methods of Constructing Triangle • Step 1 : **DRAW BC =5.4 CM

B

C 5.4 CM

Methods of Constructing Triangle • Step 2 :

• **AT B, construct ∟CBP = 450

P

450 B

C

Methods of Constructing Triangle • Step 3 : **AT C, construct∟BCQ = 600 . Q

P A

600

45

0

B

5.4 CM

C

Methods of Constructing Triangle • Step 4: **If BP and CQ iniersect at a, then ABC is the **required triangle. QQ P A

600

450

B

5.4 CM

C

THANKS TO COMPUTER DEPARTMENT GOVT SEN SCHOOL VERKA(B)

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Books Reffered:-9TH CLASS

MATHS(I.C.S.E)