Question

The area of a triangle is 60sq cm and one of its sides is 12 cm . Find the perpendicular distance to that side from the opposite corner​

Answer 1

Step-by-step explanation:

(A) Main Concepts and Results

• Rectangle

(a) Area = length × breadth

(b) Perimeter = 2 (length + breadth)

(c) Diagonal = ( )( ) 2 2 length + breadth

• Square

(a) Area = (side)2

(b) Perimeter = 4 × side

(c) Diagonal = 2 × side

• Triangle with base (b) and altitude (h)

Area =

1

2

× ×b h

• Triangle with sides as a, b, c

(i) Semi-perimeter = 2

abc

s

+ + =

(ii) Area = ss a s b s c ( )( )( ) ––– (Heron’s Formula)

• Isosceles triangle, with base a and equal sides b

HERON’S FORMULA

CHAPTER 12

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