Question

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Answer 1

Answer:

13a-b

Step-by-step explanation:

(2a+4a+7a)+(3b-3b-b)=13a-b

Answer 2

Answer:

Step-by-step explanation:

ANSWER:-

What is perimeter?

The total sum of the sides of a figure is called a perimeter. This contains basic arithmetic addition. In some solid shapes, we generally use direct formulas which were formulated earlier.

According to question,

• 2a+b
• 4a+3b
• 7a-b are the sides given.

Adding them all, we get

$2a+3b+4a+3b+7a-b$

$\longrightarrow 13a-b \ is \ the \ answer.$

Some formulas for direct perimeter and area:-

• Perimeter of Rectangle = 2*(L+B), where L and B are length and breadth.
• Area of rectangle is Length*Breadth.
• Perimeter of square is 4*side.
• Area of square is $a^{2}$ where a is side.
• Perimeter or circumference of circle is 2*pie*r
• Pie value is 22/7 or 3.14
• Perimeter of triangle is side+side+side.
• While are is Heron's formula.

$s = \frac{a+b+c}{2}$ where s is semi perimeter.

$Area = \sqrt{s(s-a)(s-b)(s-c)}$, for area of triangle.

In case of right angle triangle:-

$\frac{1}{2}\times base \times height$.