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3 years ago

How does an indirect proof differ from a regular proof ?

Mathematics

2 answers:

Vlad [161]3 years ago

6 0

Answer and Step-by-step explanation:

Regular proof is a method of proving the statement directly.

In this method, we just proved it by using direct formula or theorem.

whereas,

Indirect proof is a way of proving by contradiction.

In this method we assume first that the given statement is false, then it is proved correct by contradiction.

ss7ja [257]3 years ago

3 0

Answer:

Regular proof is all about known facts that is for e.g X must be true, while in indirect proof you assume X is true

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Part 1) A 20° sector in a circle has an area of 21.5π yd².

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we know that

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the answer part 1) is

The area of the circle is $1,215.18\ yd^{2}$

Part 2) What is the area of a sector with a central angle of 3π/5 radians and a diameter of 21.2 cm?

we know that

the area of the circle is equal to

$A=\pi r^{2}$

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in this problem we have

$Diameter=21.2\ cm\\ r=Diameter/2\\r=21.2/2\\r= 10.6\ cm$

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$A=352.8104\ cm^{2}$

Find the area of the sector

we know that the area of the circle represent a sector of $2\pi$ radians

by proportion

$\frac{352.8104}{2\pi }=\frac{x}{(3\pi/5)} \\\\x*2\pi=(3\pi*352.8104)/5\\ \\x= 105.84\ cm^{2}$

therefore

the answer part 2) is

the area of the sector is

$105.84\ cm^{2}$

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3 years ago

Help meeeeedkxkdjsjs

Alex

18 - (8 - 3 • (2t + 5)) = 0

6t + 25 = 0

3.1 Solve : 6t+25 = 0

Subtract 25 from both sides of the equation :
6t = -25
Divide both sides of the equation by 6:
t = -25/6 = -4.167

Final answer is

t = -25/6 = -4.167

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