HEREDITY
BACKCROSS OR TESTCROSS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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6
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7
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5
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4
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Detailed explanation-1: -The side whose value is 4 would not work to make a triangle with the side lengths of 2 and 6.
Detailed explanation-2: -9 cm, 5 cm, 7cm cannot form the sides of a right triangle as the Pythagoras theorem is not satisfied in this case.
Detailed explanation-3: -The lengths 4, 5, 10 also cannot make a triangle because 4 + 5 = 9 < 10 . Look at the pictures below: The arcs show that the two sides would never meet to form a triangle. To make a triangle, two sides must add up to be greater than the third side.
Detailed explanation-4: -Correct answer: The sum of the lengths of two sides of a triangle cannot be less than the length of the third side.
Detailed explanation-5: -Let us revise a fundamental property-“Three numbers cannot form a triangle if the sum of any two is less than the third".