Please answer quick!!

Mathematics

1 answer:

Anon25 [30]3 years ago

7 0

Answer:

if u answer my question i will answer your

Step-by-step explanation:

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The perimeter of square ground is 122

Hatshy [7]

Answer:

i. 30.5m

ii. 930.25m²

iii. Rs. ‭37,218‬

Step-by-step explanation:

Perimeter of a square = 4 * Length

i. Length = Perimeter/4

= 122/4

= 30.5 m

ii. Area = Length * Height

= 30.5 * 30.5

= 930.25 m²

iii. Cost of growing grasses at Rs. 40 per m²

= 930.25 * 40

= Rs. ‭37,218‬

5 0

2 years ago

Root 3 cosec140° - sec140°=4 prove that

Lorico [155]

Answer:

Step-by-step explanation:

We are to show that $\sqrt{3} cosec140^{0} - sec140^{0} = 4\\$

Proof:

From trigonometry identity;

$cosec \theta = \frac{1}{sin\theta} \\sec\theta = \frac{1}{cos\theta}$

$\sqrt{3} cosec140^{0} - sec140^{0} \\= \frac{\sqrt{3} }{sin140} - \frac{1}{cos140} \\= \frac{\sqrt{3}cos140-sin140 }{sin140cos140} \\$

From trigonometry, 2sinAcosA = Sin2A

$= \frac{\sqrt{3}cos140-sin140 }{sin140cos140} \\\\= \frac{\sqrt{3}cos140-sin140 }{sin280/2}\\= \frac{4(\sqrt{3}/2cos140-1/2sin140) }{2sin280}\\\\= \frac{4(\sqrt{3}/2cos140-1/2sin140) }{sin280}\\since sin420 = \sqrt{3}/2 \ and \ cos420 = 1/2 \\ then\\\frac{4(sin420cos140-cos420sin140) }{sin280}$