Question

9.26,DE=DF and ∆D=50°.find angles a,b and c.
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Answer 1

Answer:

a = 130°, b = 65°,c = 115°

Step by step explanation:

Given

DE = DF  

Angle EDF = 50°

To find

Value of a,b and c.

a = 180° - 50° ( linear pair)

a = 130°

Now, Since DE = DF (means that the ∆ is an Isosceles ∆)

According to Isosceles triangle theorem, Angles opposite to the equal sides are also equal,So

b = angle DFE. ...(i)

Now,

50° + b + angle DFE =180° (Angle sum property)

50° + b + b = 180° (from i )

2b = 180° - 50°

2b = 130°

b = 65°

c = 180° - 65° = 115°

M4RK AS BRAINLIEST

Answer 2

A=Axi^+Ayj^+Azk^

then, the angles which it makes with coordinate axes are given by:

cosθ=Amagnitude of component along concerned direction

where A is the magnitude of A is A=32+62+22=7

therefore, angle with x- axis α=cos−173

                 angle with y-axix β=cos−176  

                 angle with z-axis γ=cos−172