**Title:** Acres Away!

**Description:**
In the lesson students will use a matrix to determine the area of a triangular piece of land. The student will be supplied with state plane coordinates and conversion information to calculate the area and then convert to acres.This lesson plan was created as a result of the Girls Engaged in Math and Science University, GEMS-U Project.
**Standard(s): **

[MA2015] AM1 (9-12) 17: (+) Prove the Law of Sines and the Law of Cosines and use them to solve problems. Understand Law of Sines = 2*r*, where *r* is the radius of the circumscribed circle of the triangle. Apply the Law of Tangents. [G-SRT10] (Alabama)

**Subject:**Mathematics (9 - 12), or Technology Education (9 - 12)

**Title:**Acres Away!

**Description:**In the lesson students will use a matrix to determine the area of a triangular piece of land. The student will be supplied with state plane coordinates and conversion information to calculate the area and then convert to acres.This lesson plan was created as a result of the Girls Engaged in Math and Science University, GEMS-U Project.

**Title:** Law of Cosines

**Description:**
In this Illuminations lesson, students use right triangle trigonometry and the Pythagorean theorem to develop the law of cosines. Included is a link to an online activity sheet.
**Standard(s): **

[MA2015] AM1 (9-12) 17: (+) Prove the Law of Sines and the Law of Cosines and use them to solve problems. Understand Law of Sines = 2*r*, where *r* is the radius of the circumscribed circle of the triangle. Apply the Law of Tangents. [G-SRT10] (Alabama)

**Subject:**Mathematics

**Title:**Law of Cosines

**Description:**In this Illuminations lesson, students use right triangle trigonometry and the Pythagorean theorem to develop the law of cosines. Included is a link to an online activity sheet.

**Thinkfinity Partner:**Illuminations

**Grade Span:**9,10,11,12

**Title:** The Law of Sines

**Description:**
This student reproducible, from an Illuminations lesson, guides students as they use right angle trigonometry to develop the law of sines.
**Standard(s): **

[MA2015] AM1 (9-12) 17: (+) Prove the Law of Sines and the Law of Cosines and use them to solve problems. Understand Law of Sines = 2*r*, where *r* is the radius of the circumscribed circle of the triangle. Apply the Law of Tangents. [G-SRT10] (Alabama)

**Subject:**Mathematics

**Title:**The Law of Sines

**Description:**This student reproducible, from an Illuminations lesson, guides students as they use right angle trigonometry to develop the law of sines.

**Thinkfinity Partner:**Illuminations

**Grade Span:**9,10,11,12