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1. If AC = 56 cm., what is DB?
2. If AC=2x + 10 and DB= 4x – 6, what is AC?
3. If DB = 3y + 7 and AC= 6y -8, what is DB?


Sagot :

Answer:

1)54

2)The value of ac is 26

Step-by-step explanation:

1)______

2)Identify:

•ac

where,

Two diagonals of a rectangle are equal,

ac = DB

apply this property of rectangle to find the value of ac

Given:

•ac = 2x + 10

•db = 4x - 6

Solution:

ac = db

2x + 10 = 4x - 6

2x - 4x = -6 -10

-2x = -16

-2x/-2 = -16/-2

x = 8

Plugin the value of x in ac equation to find the value of ac

ac = 2x + 10

= 2(8) + 10

= 16 + 10

ac = 26

Check:

ac = db

2x + 10 = 4x - 6

2(8) + 10 = 4(8) - 6

16 + 10 = 32 - 6

26 = 26

This proves that the two diagonals of the rectangle are equal.

Answer:

The value of ac is 26