每周一题

Math Daily

Find the Area of the Square 求 荫 影 面 积

Find the Area 求 荫 影 部 分 面 积
Points E, F, G and H are midpoints of sides of square ABCD as shown. If AB is 20 units long, then what is the area of the shaded region?

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上 期 答 案: Area = 2 square units

求三角形面积 Please Find the Area of a Triangle:

What Is the Area of the Triangle? 求 面 积

Find the area of the triangle with vertices at coordinates (0, 0), (3, 4), (5, 8).

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上期答案: 4个。

Prime Numbers 素 数 之 谜

Prime Numbers 素 数 之 迷

How many two digit prime numbers are there in which both digits are prime numbers? (For example, 23 is one of these numbers but 31 is not, since 1 is not a prime number.)

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上期答案: Answer: (a)
Solution1: Experimenting with the numbers in turn, dividing 6 into15 and 10 into15, we get answers one whole number apart, so they are together again at 15 minutes.

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