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kari74 [83]
4 years ago
10

If BC = 6 and AD = 5, find DC. 4 4.5 7.2

Mathematics
1 answer:
anygoal [31]4 years ago
4 0

Answer:

The length of CD is 4 units

Step-by-step explanation:

Given the triangle ABC and if BC = 6 units and AD = 5 units

we have to find the length of DC.

In ΔABC and ΔBDC

∠ABC=∠BDC    (each 90°)

BC=BC   (common)

∠C=∠C   (Common)

By ASA rule, ΔABC≈ΔBDC

Therefore their corresponding sides are in proportion

\frac{BC}{AC}=\frac{BD}{AB}=\frac{CD}{BC}

\frac{BC}{AC}=\frac{CD}{BC}

Let CD=x units

BC^2=(AC)(CD)

6^2=(AD+CD)CD

36=(5+x)x

36=5x+x^2

x^2+5x-36=0

x^2+9x-4x-36=0

x(x+9)-4(x+9)=0

(x-4)(x+9)=0

x=4, -9

Distance can't be negative therefore

The length of CD is 4 units

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