An arrangement of marbles has 12 marbles in the first row and 10 rows in all. In each successive row one marble is added.
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Answer:
Step-by-step explanation:
<h3>45° - 45° - 90° triangle:</h3>The ratio of sides of 45 - 45 - 90 triangle is a : a : a√2.
a is the side opposite to 45°.
From the figure, a = 5√11
The side opposite to 90° is a√2.
y = a√2