What is the formula for surface area
2 answers:
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Answer:
B
Step-by-step explanation:
First calculate BD using sine ratio in Δ BCD and the exact value
sin60° = , thus
sin60° = =
=
=
( cross- multiply )
2BD = 12 ( divide both sides by 2 )
BD = 6
-----------------------------------------------------------
Calculate AD using the tangent ratio in Δ ABD and the exact value
tan30° = , thus
tan30° = =
=
=
( cross- multiply )
AD = 6
( divide both sides by
)
AD = 6 → B
-1, 260
First , take a look at the signs of the numbers we're asked to multiply .
One of them is negative , and the other one is positive .
If we have a negative number times a positive number , the product is a positive number .
Multiply :
(-315) × 4
-1, 260 (Ans)