Question

16 cm
The cross-section of a piece of metal 2 m in length is shown in
the adjoining figure.
Calculate : (i) the area of its cross-section;
ce of metal 2 m in
T
12 cm
--8cm
-13 cm
(ii) the volume of piece of metal;
(iii) the weight of piece of metal to the nearest kg,
if 1 cm3 of the metal weighs 6.5 g.​

Answer 1

Answer:Let the breadth of the given rectangle be x cm.  

Then, length =(x+8) cm

Now area =240cm  

2

 

⇒length×breadth=240⇒(x+8)x=240

⇒x  

2

+8x−240=0⇒x  

2

+20x−12x−240=0⇒(x+20)(x−12)=0

⇒x=12orx=−20

But x cannot be negative, So, x=12

Hence, length =x+8=12+8=20cm and breadth =12cm

Step-by-step explanation: