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Mathematics > Triangles > Learn Triangles

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Answered on 09/12/2016 Learn Triangles +2 Mathematics

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What do you mean by projection rule?

Ankit

JEE/Board Maths Tutor

Projection Formula gives the relation between angles and sides of a triangle. We can find the length of a side of the triangle if other two sides and corresponding angles are given using projection formula. If a, b and c be the length of sides of a triangle and A, B and C are angles opposite to the sides... read more
Projection Formula gives the relation between angles and sides of a triangle. We can find the length of a side of the triangle if other two sides and corresponding angles are given using projection formula. If a, b and c be the length of sides of a triangle and A, B and C are angles opposite to the sides respectively, then projection formula is given below: a = b cos C + c cos B b = c cos A + a cos C c = a cos B + b cos A read less
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Answered on 09/12/2016 Learn Triangles +2 Mathematics

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What do you mean by Napier’s Analogy?

Ankit

JEE/Board Maths Tutor

Definition of Napier's analogies: Four formulas giving the tangent of half the sum or difference of two of the angles or sides of a spherical triangle in terms of the others.
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Answered on 09/12/2016 Learn Triangles +2 Mathematics

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What is the trigonometrical formula of Sin A / 2 for half angle?

Ankit

JEE/Board Maths Tutor

2sin(A/4).cos(A/4).
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Answered on 07/12/2016 Learn Triangles +2 Mathematics

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What is the area of triangle?

Siva Kumar

Expert

(height*base)/2.
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Answered on 06/12/2016 Learn Triangles +2 Mathematics

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What is the difference between circumcircle and incircle?

Nirmal Bhasu D.

Maths Tutors

Circumcircle is the circle which passes through the vertices of triangle and Incircle is the circle which touches the sides of triangle.
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Answered on 09/12/2016 Learn Triangles +2 Mathematics

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What do you mean by escribed circle?

Ankit

JEE/Board Maths Tutor

Define escribed circle: A circle outside of a triangle that is tangent to one of its sides and also to the other two sides that have been extended.
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Answered on 09/12/2016 Learn Triangles +2 Mathematics

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What is the process for measuring radius of the inscribed and circumscribed circles of regular polygon?

Ankit

JEE/Board Maths Tutor

Dist. of centre from vertex will give circum radius. perpendicular dist. of centre from side will give inradius.
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Answered on 09/12/2016 Learn Triangles +2 Mathematics

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Define ptolemy’s theorem?

Ankit

JEE/Board Maths Tutor

In Euclidean geometry, Ptolemy's theorem is a relation between the four sides and two diagonals of a cyclic quadrilateral (a quadrilateral whose vertices lie on a common circle). The theorem is named after the Greek astronomer and mathematician Ptolemy (Claudius Ptolemaeus).
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Answered on 08/12/2016 Learn Triangles +2 Mathematics

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What is the difference between angle of elevation and angle of depression?

Prasanna Shah

Maths expert

Angle of elevation is used when eye is observing any object above it and angle of depression is used when eye is observing any object below it.
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Answered on 07/12/2016 Learn Triangles +2 Mathematics

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What is the formula for measuring distance from height to hypotenuse of a right triangle?

Veeranna

Math Magician

Ac2=ab2+bc2.
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