6. A person on the edge of a canal observes a tower on the other side with an angle of elevation of 12° to the top of the tower and an angle of depression of 7° to the bottom of the tower from eye level. The person's eye level is 152 cm. Both sides of the canal are at the same level. What is the width of the canal and the height of the tower? (round 2 dp)

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Power Operation

Power operation is topic of algebra in Math. It is use to represent repeated multiplication. Very big number and very small number can be easily express using power operation. Power operation is useful in many fields. In space engineering, it helps in representing the distance or size of particular heavenly body. In medical field, it is used to represent very small size. In medical field it helps to mention size of bacteria or virus. 

Exponents

The exponent or power or index of a variable/number is the number of times that variable/number is multiplied by itself.