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Tcecarenko [31]
3 years ago
8

Find area of sector: centeral angle=60 r=7 PLZ HELP ME I WILL GIVE BRAINLIEST!!

Biology
2 answers:
alisha [4.7K]3 years ago
7 0

Answer:

25.7units^2

Explanation:

formula or area of sector:

(centeral angle/360)*pi*r^2

so 60/360=1/6

1/6*pi*7^2

1/6*pi*49

1/6*pi=0.52359877559

0.52359877559*49=25.6563400043

25.7 units^2

Hope this helps!

geniusboy [140]3 years ago
6 0

Answer:

25.65

Explanation:

60/360*pi*49=25.6563400043

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Meiosis It is one of the ways of cell reproduction. This process is performed in the cells in the sex cells. It is a process of cell division in which a diploid cell (2n) undergoes two successive divisions, with the ability to generate four haploid cells (n). This process is carried out in two nuclear and cytoplasmic divisions, called first and second meiotic division or simply meiosis I and meiosis II

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Phases of Meiosis

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- MEIOSIS I: Prophase I

During mating, a key event occurs in the matching of homologous chromosomes.

- Metaphase I

In Metaphase I the tetrads line the equator of the cell. The spindle fibers "stick" to the centromere of each homologous pair and subsequent events are similar to mitosis.

- Anaphase I

During Anaphase I the tetrads separate and the chromosomes are dragged to the opposite poles by the spindle fibers. The centromeres in Anaphase I remain intact.

- Telophase I

Telophase I is similar to mitosis, except that in the end each "cell" has only one group of replicated chromosomes. Depending on the species, the new nuclear membrane can be formed (or not). Some animals can divide their centrioles during this phase.

Telophase may be absent in some species. If there is, it is followed by an interface called interkinesis; Unlike the mitotic interface, there is no duplication of genetic material since each chromosome already has two chromatids. The other difference is that these sister chromatids are no longer genetically identical, due to the cross-linking phenomenon.

- MEIOSIS II: Profase II

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- Metaphase II

Metaphase II is similar to that of mitosis, with chromosomes in the equatorial plane and spindle fibers sticking to the opposite faces of the centromere in the kinetochore region.

- Anaphase II

During Anaphase II, the centromere divides and the then chromatids, now chromosomes, are secreted to the opposite poles of the cell.

- Telophase II

Telophase II is identical to Telophase of mitosis. Cytokinesis separates the cells.

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- Mitosis maintains the level of ploidy while meiosis reduces it.

- Meiosis can be considered as a phase of chromosome number reduction followed by a slightly different mitosis.

- Meiosis only occurs in relatively few cells of a multicellular organism, while mitosis is more common.

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