Answer:
49 cm²
Step-by-step explanation:
The volume (V) of a cube is calculated as
V = s³ ← s is the length of the side, thus
s³ = 343 ( take the cube root of both sides )
s = = 7, thus
area of base = s² = 7² = 49 cm²
Which of the following statements are true
1 answer:
Answer: B , c, E
Step-by-step explanation:
Given that ,
∡J=90° , ∡k=30° , ∡L=60°
In the triangle ΔJKL,
tan ∠L = tan 60°
⇒ JK÷JL= √3
⇒JK = √3JL
Thus, A is incorrect and B is correct
Again,
cos ∠L = cos60° =0.5
⇒JL/KL = 1÷2
⇒ JL = (1÷2)KL
⇒JL×2= KL
⇒ KL=2JL
Hence, F & D are incorrect and C is correct
Earlier we got,
JK = √3.JL
⇒JL=JK÷√3
and JL= (1÷2).KL
So, JK÷√3=(1÷2)KL
⇒JK÷√3×2 = KL
⇒2.JK= √3KL
⇒JK = (√3÷2).KL
hence E is correct
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(6,3)
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