Solution:
Given
Area of the circular table (A) = 154 square feet
Let 'r' be the radius and 'd' be the diameter of the circle
Use the formula,
A = ∏ r2
=> 154 = 22/7 * r2
=> 154 x 7/22 = r2
=> 7 x 7 = r2
=> r = 7
and d = 2 r = 2 x 7 = 14
=> Radius of circular table = 7 feet
and diameter = 14 feet.
Usually students find Grade 7 Math entirely different from whatever they had learned in lower grades. Mathematics in 7th grade becomes more descriptive and illustrative. It contains axioms and theorems. It contains concepts which if mastered, are quite useful in higher studies.