Q8. If cos (40° + A) = sin 30°, then value of A is

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Q8. If cos (40° + A) = sin 30°, then value of A is

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(a) 30°
(b) 40°
(c) 60°
(d) 20°

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Class 10 Maths swatiqna 3 years 2021-12-23T10:48:11+00:00 2021-12-23T10:48:11+00:00 1 Answer 12 views Enlightened 0

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A scale drawing of an object is the same shape at the object but a different size. The scale of a drawing is a comparison of the length used on a drawing to the length it represents. The scale is written as a ratio. The ratio of two corresponding sides in similar figures is called the scale factor Scale factor= length in image / corresponding length in object If one shape can become another using revising, then the shapes are similar. Hence, two shapes are similar when one can become the other after a resize, flip, slide or turn. In the photograph below showing the side view of a train engine. Scale factor is 1:200 This means that a length of 1 cm on the photograph above corresponds to a length of 200cm or 2 m, of the actual engine. The scale can also be written as the ratio of two lengths.The length of AB in the given figure:
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swatiqna Enlightened · Answer 1 · 2021-12-23T10:48:55+00:00

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2021-12-23T10:48:55+00:00 December 23, 2021 at 10:48 am

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Answer: (d) 20°
cos(40+x)=sin30
sin(90−(40+x))=sin30
90−40−x=30

50−x=30
x=20∘

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Q8. If cos (40° + A) = sin 30°, then value of A is

Q8. If cos (40° + A) = sin 30°, then value of A is

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