3 years ago

Find the surface area of the sphere.

Mathematics

1 answer:

Mila [183]3 years ago

6 0

$A = 201.1\:\text{cm}^2$

Step-by-step explanation:

Given: r = 4 cm

The surface area A of a sphere is given by

$A = 4\pi r^2 = 4\pi(4\:\text{cm})^2$

$\:\:\:\:\:= 201.1\:\text{cm}^2$

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crimeas [40]

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3 years ago

TanA+tanB+tanAtanB=1 If A+B=45 degree

djyliett [7]

Answer:

See below

Step-by-step explanation:

$\tan A+\tan B + \tan A.\tan B = 1\\\\ \implies \: \tan A + \tan B = 1 - \tan A.\tan B \\ \\ \implies \: \frac{\tan A + \tan B}{ 1 - \tan A.\tan B } = 1\\ \\ \implies \: \tan (A + B) = 1 \\ \\ \implies \: \tan (A + B) =\tan 45 \degree \\ \\ \implies \: A + B = 45 \degree \\ \\ thus \: proved$