What's an easier way from multiplication ?
2 answers:
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Answer:
see explanation
Step-by-step explanation:
a
The tangent and the radius at the point of contact form a right angle
Using Pythagoras' identity on the right triangle formed.
Let x be the distance from the centre to P, then
x² = 4² + 10² = 16 + 100 = 116 ( take the square root of both sides )
x = ≈ 10.77 cm (to 2 dec. places )
b
let the required angle be Θ, then
Using the sine or cosine ratio in the right triangle.
cosΘ = =
Θ = (
) ≈ 21.8°
Answer:
w= -5
Step-by-step explanation:
- -2w - 4 = 6
- -2w - 4 + 4 = 6 + 4
- -2w = 10
Isolate "w":
- w = -5