Question

Sectiph A
1. The area of two sim ar triangles are 25 sq cm
and 121 sqcm. Find the ratio of their
corresponding side.​

Answer 1

Answer:

Heating as a transfer of energy

thermal

heat

temperature

In the last chapter we looked at thermal systems. The thermal energy of an object is the amount of energy it has inside of it, in other words, its internal energy. In a thermal system, thermal energy is transferred from one object to another. Heat is the transfer of thermal energy from a system to its surroundings or from one object to another. This transfer of energy is from the object at a higher temperature to the object at a lower temperature.

It is very important to know that, in science, heat and temperature are not the same thing.

Heat is the transfer of thermal energy from a system to its surroundings or from one object to another as a result of a difference in temperature. Heat is measured in joules (J). This is because heat is a transfer of energy.

Temperature is a measure of how hot or cold a substance feels and it is measured in degrees Celsius (°C). Temperature is a measure of the average kinetic energy of the particles in an object or system. We use a thermometer to measure the temperature of an object or substance

Answer 2

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Required answer-:

The ratio of areas of two similar triangles is the square of corresponding side's ratio. for example, Let \Delta ABCΔABC and \Delta DEFΔDEF are two similar triangles then,

$\frac{Δabc}{Δdef}$=$\frac{ab²}{de²}$=$\frac{bc²}{ef²}$=$\frac{ca²}{fd²}$

Here,area of two similar triangles are 25cm² and 121 cm² Let ∆ABC = 25cm² and ∆DEF = 121cm²

so, $\frac{∆ABC}{∆DEF}$ = $\frac{AB²}{DE²}$

or, $\frac{25}{121}$ = $\frac{AB²}{DE²}$

or, ($\frac{5}{11}$)² = $\frac{AB²}{DE²}$

or, $\frac{AB}{DE}$= $\frac{5}{11}$

hence, ratio of their corresponding sides is 5 : 11

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