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2 years ago

How are relative dating and absolute dating different?

Geography

1 answer:

Ivanshal [37]2 years ago

4 0

Answer:

Relative dating gives the order in which a rock layer formed compared to those around it by using layering and fossils, while absolute dating can give the age in years by using half-lives of radioisotopes.

Explanation:

The relative dating and the absolute dating use different methods, have different purposes, but they still manage to complement each other.

The relative dating is not a dating method that provides information about the exact time of a rock or a fossil. Instead, this method is comparative. It is using comparison of the layers of rock and the fossils in them, having a rough age span for them, and it provides information about the period in which a rock layer has formed, or a life form has been living.

The absolute dating has the purpose of providing information about the exact age of a rock layer or fossil. In order to do so, this method uses the half-lives of radioisotopes, so it manages to provide either the exact age, or to have a very small margin of error in the exact age.

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2 years ago

BD is the angle bisector of ZABC

Thepotemich [5.8K]

Answer:

x = 7, y = 2

Explanation:

Two triangles are said to be congruent if all three sides and three angles of one triangle is equal to three sides and three angles of the other triangle.

From the question:

BD ≅ BD (reflexive property of equality)

Since BD is the angle bisector of ∠ABC, hence ∠ABD = ∠CBD

∠ABD = 2x + y, ∠CBD = 14 + y. Therefore:

2x + y = 14 + y

2x = 14 + y - y

2x = 14

x = 14 / 2

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Since ∠BAD = ∠BCD, BD ≅ BD and ∠ABD = ∠CBD, therefore ΔABD is congruent to ΔCBD by angle-angle-side congruence theorem.

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ΔABD is congruent to ΔCBD, therefore AD = CD

5x - y = x + 13y

13y + y = 5x - x

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y = 4(7) / 14

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