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Yogita Ingle 6 years, 10 months ago
Perimeter of square = side × side
81 = side × side
side = 9 cm
perimeter of square = 4 × 9 = 36 cm
But perimeter of square = perimeter of rectangle
2(6) + 2(x) = 36
12 + 2x = 36
2x = 36 -12
2x = 24
x = 12 cm
Area of rectangle = 12 × 6 = 72 sq. cm
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Yogita Ingle 6 years, 10 months ago
Dr. Beaumont was a surgeon in US army. He treated the person named Alexis St. Martin who was accidently shot in the stomach that injured his ribs and stomach. After treatment there remained hole in his stomach that never filled.
Dr. Beaumont then did various experiments by using stomach of St. Martin to study the digestion in stomach. During his experiments, he used to insert food tied to string in the stomach through the hole and then study how well food was digested. He also extracted hydrocholoric acid from his stomach. He used this acid to digest bits of food in cups. This lead to the discovery that not only crushing of food by stomach muscles helps in digestion but hydrocholoric acid also helps in the digestion of food.
Posted by Soham Bharambe 6 years, 10 months ago
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Yogita Ingle 6 years, 10 months ago
- Isaac Newton is one of the most famous scientists of all time, and he discovered some amazing things.
- He was born in Woolsthorpe, England on 4 January 1643.
- He discovered what is called the Law of Universal Gravitation .
- He also discovered the Laws of Motion on which mechanics is based.
- The first law of motion he described as, “An object in motion wants to stay in motion, and an object at rest wants to stay at rest.”
- He invented the Reflecting Telescope where he used mirrors to reflect light and create images from that.
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Saksham Singh 6 years, 10 months ago
1Thank You