(-13) + (-20) - (-17)
Answers
Answer:
According to the Question
When two cube with edges are joined end to end . It form new shape Cuboid. So the dimension in this case are
Length ,l = 6+6 = 12 cm
Breadth ,b = 6 cm (remain same)
Height, h = 6 cm (remain same)
So we have to calculate the surface area of Cuboid(S).
• Surface Area = 2(lb+bh+lh)
Substitute the value we get
:\implies:⟹ Surface Area = 2(12×6+6×6+12×6)
:\implies:⟹ Surface Area = 2(72 +36 +72)
:\implies:⟹ Surface Area = 2(180)
:\implies:⟹ Surface Area = 360 cm²
Hence, the surface area of the resulting cuboid is 360cm². Required Option is (b) 360cm².
_______________________________
(2)
Now, we have to calculate the slant height .
height ,h = 40 cm
radius ,R = 24 cm
radius ,r = 15 cm.
• Slant height, l² = h² + (R -r)²
Substitute the value we get
\longrightarrow⟶ l² = 40² + (24-15)²
\longrightarrow⟶ l² = 1600 + (9)²
\longrightarrow⟶ l² = 1600 + 81
\longrightarrow⟶ l² = 1681
\longrightarrow⟶ l = √1681
\longrightarrow⟶ l = 41
Hence , the slant height is 41 cm
Answer:
Geometry is, with arithmetic, one of the oldest branches of mathematics. It is concerned with properties of space that are related with distance, shape, size, and relative position of figures. A mathematician who works in the field of geometry is called a geometer.
Explanation:
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